i called david petraeus. >> and are you going to investigate why the fbi didn't notify you before? >> yes, absolutely. this is something that could have had an effect on national security. i think we should have been told. there is a way to do it. >> and several top republicans are demanding petraeus come back to capitol hill this week to testify before congress over the attack on the american consulate in benghazi. >> i don't see how in the world you can find out what happened in benghazi before, during and after the attack if general petraeus doesn't testify. so from my point of view, it's absolutely essential that he give testimony before the congress so we can figure out benghazi. >> let me bring in the editor in chief for "reason" magazine matt welch and jackie kucinich. we know the fbi was looking at all of this for a while. officials tell nbc news the investigation started this summer after another woman, jill kell kelley, described as a friend of david petraeus, told another person at the fbi that she's getting threatening e-mail. should the fbi have alerted someone in cong